Hammer attachment for electric drills and the like



April 3, 1928.

Filed Aug. 10, 1925 INVENTOR.

WM SM QM 6-+.'6,.Fig. "1; i i

' My invention comprises generally, an else- Patented Apr. 3, 19128.

umzrse sia This JOHN nuisance, or sizmcosn YORK. o

QPATEEZNT car es.

& i [1,665,173

application filed August 1041925. 's iiai 'fio; teams.

My invention relates to halnl'll'lvjfll'tilfanism, and has for itsobject a partlcul'a'i ly simp'le' hammer attachment forelect ric drillsand'th'e like, Which'can 'b 'quichly andeasily attached and detached andis highly *efiicient and durable in use.

The invention consists *in the novel features and in the combinatlons'and constructions heremafter set forth and claimed.

' In describing -this invention reference is had to the accompanyingdrawings in like characters designate I "corresponding parts in all theviews.

Figured is-aside elevation partly in scc- I 'tion of an electric drillwith my hammer attachment fixed thereto. I

I F igure Zisa face view of one 0f the lifting ciams. II

Figure 3 isa se'ct'ional vi w taken'on line Figure *4 is a: longitudinalsectional "view of the reversible collar for holding the tools. v

Figure 5 is an end elevation of the collar shown in Fig. 4.

Figure 6 is a sectional View taken on ime trio drill including theus'i'1al -fevolvingichuck and a body portion for-supporting said ivolving chuck, "hammer mechanism ln'c'luding a'ca'sin'g and a recirocating heath-means for attaching the casing of the hammer mechanism to"the 'bodyy po'rtio'n off the "elec- -tric drill, and meansforconrieictirig the re- 'ciprocatmg head to the revolving chuck for"operating 1 said reciprocating head.

In the drawing 1 represents an "electric drill of any Well know'n type,having the I usual frame or body portion 2 "enclosing an "electricmotor; and the usual chuck or tool holder 8, mounted on *the 'powershaft aof said-electric motor. I

The hammer mechanism as here shown comprises acasing 5, and areciprocating hammer head 6 mounted therein.

The casing 5 as'here shown is cylindrical in general form and the frontend 7 of the I body 2 of the electric drill is circular and is formednear said front end With a shoulder 8. The rear end of the casing 5 fitsover said front end and abuts against the shoulder 8 and is securedthereto as by the screws 9,

'Any other desirable means of fastening the casing of the hammermechanism to the "used.

1 The front end of the easing 5fas h r shown is formed withan inturhedflange 10 "and 'a member llis seated therein and is formed with areduced threaded cdllar {12 extending through said front "end and With"Ran :nxia'l passage 13 extending therethrough "forming' a hearing forthe hammer head The inner end face 'of the member l'li is formed withteeth 14 airound the passage 13," I

"oviding eam sur faces I5 to-be i said teeth p hereinafterdescribed. Y II The har'ni'ner head "6 'ext'ends through the passage 13 and "as shownin body portion of the 'e'letric aim ma he I Fig. *1; is formed with anenlarged portion 16 intermediate its I ends and said enlarged portionisforined with te th 1:7 havifigfca m surfaces enacti g :with the eam surfacjes =15 on the part 131 The enlarged :po'i tion' :16 o'f"t'h'ehamm'er head 6 is preferably made separate fron the "shank -=thereof andherej shown is fixed thereto b y the ;pin 18. The inner end thereof isipreferably reces ed as *at 19, and (a compression Sprin g' -QO isinterposed between the hotttnnoi the recess pOrt'iOnJQ' andthe ehuck'S.

A2 1 is a power shaft "which is cla'mped in *the chuck?) in :pl'a'c'efofthe' usual 'drill and in the samema nner; i I

-I have here shown the inn'er' end -of the hammer head 6 as beingcouhterboredand 1 formed With adengtlrwise "slot. 22 extendii'igdiametricallfv-therethrough. I i Thefouter endof 'he power sha ftslidabl'gv fits said counterbore and is pmvided with aipin 28wliich'co'actswith theslotIQ Q, there-' As Willbe obvious tothoseskilled in the' art the number of'teeth or'cam surfaces on thecoacting backs Will determine the 'numher of strokes per. revolution ofthepower ion 7 l threads upon the reducedcollar 12 of the v of thecasing;

I have here shown four teeth 011 each of the coacting parts, butvobviously any desirable number may be provided.

For convenience of manufacture and assembling the part 11 is held fromrota- :tion with respect to the casing by meansof the spring presseddowel pins 24: coacting with'aligned holes in the inturnedflange 10,

and as shownin Fig. 1, is locked in posi tion by means of thetoolfholder25 which part 11 and againstfthe inturned flange In tools of thisdescription the hammer head does not as a rule act directly upon the:work', but acts upon a tool'as forins'tance the tool 26 which is hereshown as a star drill having a hexagonal shaped orcsi-x' sided shank.Vhen using a-tool in tho-holder of the type illustrated'it is desirablethat .thetool should. change its striking point at every blow of thehammer, while withother types-of tools it is essential :that the toolused in the holder docs not change its striking point.

In 'my' invention-.1 have provided a construction whereby simplyreversing the-position of one 111Gl1'1b8r,'tl1(311001WVlll have anaxiallmovementor will-not have an axial movement. q x

27 is the reversible member and as shown in F1gs.,1, land 5. compr1ses asleeve fitting within the tool holder 25, the inner diameter of oneendas 28. being round approximately *one third of, its length andslidablyfitting the outer diameter of the shank'of the hammer head 6.' Therest-of the sleeve on the inside is cut hexagonal or out of round, .asshown at 29, with the corners thereof a continuation of theinner-diameter of the round [portion 28. The outer endBO of the ham ImerheadG extend's intothe sleeve 27' and the tool-26 are .in thehexagonal portion of the sleeve, therefore the sleeve and-consequentlythe tool 26 will beturned'when the head is operated.

l 1. A hammer mechanism :CfiSlIlg, a tool holder fixed to one end ofsand When the sleeve 27 is reversed that is turned end for; end, theround portion 28 of the sleeve is on the hexagonal portion 30 of e thehammer head, obviously neither the sleeve northeto'ol' 26 will beturned. 7

The sleeve is heldin place by the screw cap 31 which is'provided with apacking 32 to prevent dust and dirt from getting into the hammer and toprevent grease from leaking out. 33 is a grease plug for supplying.grease to the hammer attachment.

' This hammer attachment is the reverse of the hammers now in use, aswhen the operator wants to strike a very light blow, he I forces thetool as close to the work as possible and when he desires a heavier'blowhe lets up on the pressure. 7 I

/Vhat I claim is casing, a revolving and reciprocating head 'in saidcasing having one end thereof ex comprising a' a tcndinginto one end ofsaidtool holder and provided with a non-circular portion, atool havinganoncircular portion extending into the other end of said tool holder,and a reversible means arranged in said tool holder to coactwith thenon-circularrportions of the reciprocating head and the tool to turn thetool when the head reciprocates,

or to .coact with only one of said non-circular portions, whereby thetool does not turn when the head reciprocates.

2. A hammer mechanismcomprising a-casing, a tool holder fixed to one endof' said casing, a revolvlng and reciprocatlng'head 111 said casinghaving oneendthereof extending into one end of said tool holderand 'provided with a noncircular portion, a toolhaving a noncircularportion'extending into the other end of said tool holder, and a sleevehaving a circular portion and a noncircular portion reversibly mountedin said tool holder so that thcnoncircular por tion coacts withthenoncircularportions of the head and tool or is reversed to coactwithonly one of sa1d parts;

In testimony whereof, I have hereunto .signedmy name,'at Syracuse, inthe county ofOnondagmand State-of New York, this 18th'day of July, 1925.

JOHN I-. -M1sEivnR.

